Question

In which medium longitudinal waves can be generated?

Answer 1

Longitudinal waves depend on the mechanical stiffness of the medium.

Like density and stiffness constant or modulus of elasticity.

Longitudinal waves cannot be generated if the particles cannot vibrate or oscillate or vibrate to and fro . In vacuum or extremely soft materials,we cannot generated longitudinal waves.

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Answer 2

Longitudinal waves can be generated in vacuum.
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